Trouble in the Pipeline (Hardy Boys Casefiles #26)

Frank and Joe travel to Alaska in search of a friend who has gone missing. Stone walled from their first stop and then attacked just hours later, maybe somebody really doesn't want Scott found.

Long Synopsis:

From the back of the book:
Savage test
Frank and Joe fly to Alaska to trace Scott Sanders, who's supposed to be working on a top-secret project for a mining firm. When company officials claim they've never heard of Scott, the Hardys grow suspicious. They find that some company managers have been selling jobs on the big oil pipeline. But before the brother detectives can dig deeper, they're kidnapped and forced to bail out over the Arctic wilderness. Stranded, Frank and Joe face their toughest test-fighting hunger, grizzly bears, and bullets to survive-while at trail's end a group called the Assassins waits to give them their final
exam....
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From inside the book:
UNWELCOME VISITOR
The quiet of the sunlit night was interrupted by a splashing sound. The Hardys looked up to see a large brown bear waddling toward them.
"Is it a grizzly?" Joe whispered.
"Looks like it," Frank answered, glancing at the fire. "It probably smelled the fish. Where'd you put the guts?"
"I threw them in the-" Joe stopped suddenly, staring. The fish guts had landed on a nearby rock.
The bear went right to the fish guts. In one gulp, he licked them up. Then, twitching his nose, he headed for what was left of the fish beside the fire.
"He's coming nearer," Joe whispered, eyes wide.
The bear abruptly rose up on its hind legs, throwing a long shadow that fell like night over the boys.
Then the unnatural silence was shattered with one giant roar as the grizzly began its charge!